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Illinois Department of Transportation

Water Supply, East Saint Louis, Illinois. NPDES permit IL0070955, in force until Jun 30, 2030. Last 12 months: over a limit 19 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 0 monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 19 values over a limit
Period endingParameterReportedLimitOver by
November 2025Iron, total [as Fe], daily maximum50.6 mg/L≤ 20 mg/L153%
November 2025Solids, total suspended, daily maximum56 mg/L≤ 40 mg/L40%
December 2025Iron, total [as Fe], daily maximum30 mg/L≤ 20 mg/L50%
December 2025Solids, total suspended, daily maximum1500 mg/L≤ 40 mg/L3650%
January 2026Chlorine, total residual, daily maximum.9 mg/L≤ .05 mg/L1700%
February 2026Iron, total [as Fe], daily maximum207 mg/L≤ 20 mg/L935%
February 2026Solids, total suspended, daily maximum262 mg/L≤ 40 mg/L555%
March 2026Iron, total [as Fe], daily maximum49.3 mg/L≤ 20 mg/L147%
March 2026Solids, total suspended, daily maximum72 mg/L≤ 40 mg/L80%
April 2026Iron, total [as Fe], daily maximum163 mg/L≤ 20 mg/L715%
April 2026Solids, total suspended, daily maximum78 mg/L≤ 40 mg/L95%
May 2026Iron, total [as Fe], daily maximum59.4 mg/L≤ 20 mg/L197%
May 2026Solids, total suspended, daily maximum48 mg/L≤ 40 mg/L20%
June 2026Iron, total [as Fe], daily maximum94 mg/L≤ 20 mg/L370%
July 2026Iron, total [as Fe], daily maximum63.7 mg/L≤ 20 mg/L219%
July 2026Solids, total suspended, daily maximum55 mg/L≤ 40 mg/L38%
August 2026Solids, total suspended, daily maximum224 mg/L≤ 40 mg/L460%
September 2026Iron, total [as Fe], daily maximum204 mg/L≤ 20 mg/L920%
September 2026Solids, total suspended, daily maximum212 mg/L≤ 40 mg/L430%

Limits in force (8)

ParameterStatisticLimitMonths
pHmonthly minimum≥ 6.5 SUall year
pHmonthly maximum≤ 9 SUall year
Solids, total suspendeddaily maximum≤ 40 mg/Lall year
Iron, total [as Fe]daily maximum≤ 20 mg/Lall year
Iron, dissolved [as Fe]daily maximum≤ 10 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Jul

How strict are these limits?

Cited limits by parameter: Illinois's rules and the federal ones.

Same industry: the 30 Water Supply permits in Illinois.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0070955 · MCP: https://passage-data.com/mcp